Prediction of some turbulent flows using upwind and hybrid discretısa tion schemes and the two-eouation turbulence model
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Date
1984
Authors
Choudhury, P. Roy
Gerstein, M.
Journal Title
Journal ISSN
Volume Title
Publisher
Uludağ Üniversitesi
Abstract
The paper presents the use of a numerical solution procedure for the prediction of steady, in compressible and two-dimensional turbulent flow in a pipe, in sudden expansions in pipes, and over a back ward-facing step using upwind and hybrid discretisation schemes.
The numerical procedure employs a two-equation turbulence model, which entails the solution of two differential equations of transport for characteristics of turbulence; nameIy, the kinetic energy of turbulence and its rate of dissipation. The Reynolds stresses are related to the mean velocity gradients through a scalar turbulent viscosity, calculated from the above turbulence variables. In the near-wall regions, wall functions are employed. The predictions results from simultaneous solution of differential equations for conservation of mass and momentum, together with equations describing the transport of turbulence, by means of a finite-difference solution procedure. The predictions obtained using upwind and hybrid discretisation schemes are compared with each other and with published experimental data. For flows in which recirculation is present, the use of hybrid scheme results in closer agreement with measurements. In general, the predictions made are in good qualitative agreement with experiment.
Description
Keywords
Hybrid discretisation schemes, The two-evoluation turbulence model
Citation
Karasu, T. vd. (1984). "Prediction of some turbulent flows using upwind and hybrid discretısa tion schemes and the two-eouation turbulence model". Uludağ Üniversitesi Mühendislik Dergisi, 1(1), 1-20.